%
-% (c) The GRASP/AQUA Project, Glasgow University, 1994-1998
-% Hans Wolfgang Loidl
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
+% $Id: Costs.lhs,v 1.20 2000/01/13 14:33:57 hwloidl Exp $
+%
+% Only needed in a GranSim setup -- HWL
% ---------------------------------------------------------------------------
\section[Costs]{Evaluating the costs of computing some abstract C code}
instructions.
\end{itemize}
-This function is needed in GrAnSim for parallelism.
+This function is needed in GranSim for costing pieces of abstract C.
-These are first suggestions for scaling the costs. But, this scaling should be done in the RTS rather than the compiler (this really should be tunable!):
+These are first suggestions for scaling the costs. But, this scaling should
+be done in the RTS rather than the compiler (this really should be
+tunable!):
\begin{pseudocode}
negate = mapOp negate
abs = mapOp abs
signum = mapOp signum
+ fromInteger _ = error "fromInteger not defined"
mapOp :: (Int -> Int) -> CostRes -> CostRes
mapOp g ( Cost (i, b, l, s, f) ) = Cost (g i, g b, g l, g s, g f)
CAssign (CReg _) (CTemp _ _) -> Cost (1,0,0,0,0)
- CAssign (CReg _) (CAddr _) -> Cost (1,0,0,0,0) -- typ.: add %reg1,<adr>,%reg2
+ CAssign (CReg _) source_m -> addrModeCosts source_m Rhs
CAssign target_m source_m -> addrModeCosts target_m Lhs +
addrModeCosts source_m Rhs
CSimultaneous absC -> costs absC
- CCheck _ amodes code -> Cost (2, 1, 0, 0, 0)
+ CCheck _ amodes code -> Cost (2, 1, 0, 0, 0) -- ToDo: refine this by
+ -- looking at the first arg
+
+ CRetDirect _ _ _ _ -> nullCosts
CMacroStmt macro modes -> stmtMacroCosts macro modes
-- *** the next three [or so...] are DATA (those above are CODE) ***
-- as they are data rather than code they all have nullCosts -- HWL
+ CCallTypedef _ _ _ _ -> nullCosts
+
CStaticClosure _ _ _ _ -> nullCosts
- CClosureInfoAndCode _ _ _ _ _ -> nullCosts
+ CSRT _ _ -> nullCosts
- CRetDirect _ _ _ _ -> nullCosts
+ CBitmap _ _ -> nullCosts
+
+ CClosureInfoAndCode _ _ _ _ -> nullCosts
CRetVector _ _ _ _ -> nullCosts
+ CClosureTbl _ -> nullCosts
+
CCostCentreDecl _ _ -> nullCosts
+
CCostCentreStackDecl _ -> nullCosts
CSplitMarker -> nullCosts
+ _ -> trace ("Costs.costs") nullCosts
+
-- ---------------------------------------------------------------------------
addrModeCosts :: CAddrMode -> Side -> CostRes
CVal _ _ -> if lhs then Cost (0, 0, 0, 1, 0)
else Cost (0, 0, 1, 0, 0)
- CAddr _ -> if lhs then Cost (0, 0, 0, 1, 0) -- ??unchecked
- else Cost (0, 0, 1, 0, 0)
+ CAddr (CIndex _ n _ ) -> Cost (1, 0, 1, 0, 0) -- does pointer arithmetic
+
+ CAddr _ -> nullCosts
- CReg _ -> nullCosts {- loading from, storing to reg is free ! -}
+ CReg _ -> nullCosts {- loading from, storing to reg is free ! -}
{- for costing CReg->Creg ops see special -}
{- case in costs fct -}
- CTableEntry base_mode offset_mode kind ->
- addrModeCosts base_mode side +
- addrModeCosts offset_mode side +
- Cost (1,0,1,0,0)
CTemp _ _ -> nullCosts {- if lhs then Cost (0, 0, 0, 1, 0)
else Cost (0, 0, 1, 0, 0) -}
CIntLike mode -> if lhs then Cost (0, 0, 0, 1, 0)
else Cost (0, 0, 1, 0, 0)
- CString _ -> if lhs then Cost (0, 0, 0, 1, 0)
- else Cost (0, 0, 1, 0, 0)
-
CLit _ -> if lhs then nullCosts -- should never occur
else Cost (1, 0, 0, 0, 0) -- typ.: mov lit,%reg
CMacroExpr _ macro mode_list -> exprMacroCosts side macro mode_list
+ _ -> trace ("Costs.addrModeCosts") nullCosts
+
-- ---------------------------------------------------------------------------
exprMacroCosts :: Side -> CExprMacro -> [CAddrMode] -> CostRes
in
arg_costs +
case macro of
- ENTRY_CODE -> nullCosts
- ARG_TAG -> nullCosts -- XXX
- GET_TAG -> nullCosts -- XXX
-
+ ENTRY_CODE -> nullCosts -- nothing
+ ARG_TAG -> nullCosts -- nothing
+ GET_TAG -> Cost (0, 0, 1, 0, 0) -- indirect load
+ UPD_FRAME_UPDATEE -> Cost (0, 0, 1, 0, 0) -- indirect load
+ _ -> trace ("Costs.exprMacroCosts") nullCosts
-- ---------------------------------------------------------------------------
UPD_CAF -> Cost (7, 0, 1, 3, 0) {- SMupdate.lh -}
UPD_BH_UPDATABLE -> Cost (3, 0, 0, 1, 0) {- SMupdate.lh -}
UPD_BH_SINGLE_ENTRY -> Cost (3, 0, 0, 1, 0) {- SMupdate.lh -}
- PUSH_UPD_FRAME -> Cost (3, 0, 0, 4, 0) {- SMupdate.lh -}
+ PUSH_UPD_FRAME -> Cost (3, 0, 0, 4, 0) {- Updates.h -}
+ PUSH_SEQ_FRAME -> Cost (2, 0, 0, 3, 0) {- StgMacros.h !-}
+ UPDATE_SU_FROM_UPD_FRAME -> Cost (1, 0, 1, 0, 0) {- StgMacros.h !-}
SET_TAG -> nullCosts {- COptRegs.lh -}
GRAN_FETCH -> nullCosts {- GrAnSim bookkeeping -}
GRAN_RESCHEDULE -> nullCosts {- GrAnSim bookkeeping -}
GRAN_FETCH_AND_RESCHEDULE -> nullCosts {- GrAnSim bookkeeping -}
GRAN_YIELD -> nullCosts {- GrAnSim bookkeeping -- added SOF -}
THREAD_CONTEXT_SWITCH -> nullCosts {- GrAnSim bookkeeping -}
- _ -> trace ("Costs.stmtMacroCosts: "++show macro) nullCosts
+ _ -> trace ("Costs.stmtMacroCosts") nullCosts
-- ---------------------------------------------------------------------------
primOpCosts IntQuotOp = Cost (3, 1, 0, 0, 0) + div_costs
primOpCosts IntRemOp = Cost (3, 1, 0, 0, 0) + rem_costs
primOpCosts IntNegOp = Cost (1, 1, 0, 0, 0) -- translates into 1 sub
-primOpCosts IntAbsOp = Cost (0, 1, 0, 0, 0) -- abs closure already costed
primOpCosts FloatGtOp = Cost (2, 0, 0, 0, 2) -- expensive f-comp
primOpCosts FloatGeOp = Cost (2, 0, 0, 0, 2) -- expensive f-comp
-- but these take more than that; see special cases in primOpCosts
-- I counted the generated ass. instructions for these -> checked
| IntMulOp | IntQuotOp
- | IntRemOp | IntNegOp | IntAbsOp
+ | IntRemOp | IntNegOp
-- Rest is unchecked so far -- HWL
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